Courtroom Testimony
Testimony is a continuation of your report
A subpoena is a court order; ignoring it can lead to contempt. Prepare by reviewing your report and notes, refreshing your memory, and confirming the date, time, and location. Dress professionally, arrive early, and bring your notes if allowed. You will be sworn, so tell the truth completely.
On the stand
Answer only the question asked, in plain language. If you do not know or do not remember, say so-guessing is how witnesses destroy credibility. Do not volunteer information, argue with counsel, or exaggerate. On cross-examination, pause before answering, keep your temper, and correct any misstatement promptly. You may refer to notes to refresh memory with the court's permission; you may not read a scripted answer.
Traps
Wrong answers include 'always agree with the prosecutor,' 'memorize your report word for word,' and 'fill in gaps with what probably happened.' Another trap is treating the defense attorney as an enemy; opposing counsel is doing a job, and courtesy matters. Do not discuss your testimony with other witnesses if the court instructs you not to.
Rule of thumb
If you did not see it, say you did not see it. 'I don't know' is a complete and credible answer.
Example: asked 'How far away was the man?' you answer 'About 20 feet, from my position at the door,' not 'He was close enough to be a threat.'